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# At a temperature of 27.0°what is the speed of longitudinal ISBN: 9780321675460 31

## Solution for problem 8E Chapter 16

University Physics | 13th Edition

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Problem 8E

At a temperature of 27.0°what is the speed of longitudinal waves in (a) hydrogen (molar mass 2.02 g/mol ); (b) helium (molar mass 4.00 g/mol); (c) argon (molar mass 39.9 g/mol)? See Table 19.1 for values of ?(d) Compare your answers for parts (a), (b), and (c) with the speed in air at the same temperature

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Solution 8E Given temperature, T = 27 C T = 300 K Speed of a longitudinal wave in a gas is given by, RT v H2 = M …..(1), here =ratio of specific heats, R =universal gas constant, T= temperature in absolute scale and M =Molar mass. (a) For hydrogen (2 ), M = 2.02 × 103 kg/mol, = 1.41 R = 8.314 J/k.mol Therefore, from equation (1) v H2 = 1.41×8.34×m/s 2.02×10 v H2 = 1319 m/s 3 (b) or He,...

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